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UNITED STATES PATENT OFFICE.

THOMAS J. MAYALL, OF READING, MASSACHUSETTS; LUCY A. MAYALL, OF

SAME PLACE, EXECUTRIX OF SAID THOMAS J. MAYALL, DECEASED.

ANTI-FRICTION COMPOUND.

SPECIFICATION forming part of Letters Patent No. 384,926, dated June 19, 1888.

Application filed June 21, 1887.

To all whom it may concern:

Be it known that I, THOMAS J. BIAYALL, of Reading, in the county of Middlesex and State of IVIassachusetts, have invented a new and useful Improvement in Anti-Friction Compounds, which is fully set forth in the following specification.

The object of this invention is the produc tion of an anti-friction or self-lubricating compound or material that is at the same time tough and durable.

Such compound or material is useful for a great many purposessuch as for journalboxes,pneumatic tubes, sliding ways or tracks, packing for stuffing-boxes, &c.-and is a val uable substitute for metal in most cases where friction and the heat incident thereto are to be eliminated as far as possible.

The compound is composed of rubber, sulphide of antimony, graphite, oxide of iron, and asbestus, which substances are thoroughly mixed and vulcanized in the well-known manner of preparing rubber compounds.

The compound may be made hard or soft and flexible, according to the purpose for which it is designed to be used.

In order that my invention may be fully un derstood, I will give an example of the manner of carrying the same into effect.

I take the substances above named in the proportion of two parts each, by weight, of

mixed together, run through a grinder, and sheeted or put into molds of the desired form.

Serial No. "242.034. (S ecimens) parts to the composition great toughness and 50.

durability, contributes to the formation of a hard polished anti-friction surface, and, further, gives the composition the power of with standing the effects of great heat. I employ oxide of iron in the composition, because I 55 find it assists in ell'eoting the thorough incorporation and union of the other elements.

Of course the ingredients and proportions indicated may be varied within certain limits without departing from the spirit of thein- 6o vention; i

I claim' The anti'frietion compound herein described, eonsisting of rubber, sulphide of antimony, graphite, oxide of iron, and asbestos, 65 in substantially the proportions hereinbefore set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

THOS. J. MAYALL. \Vitnesses:

PHILIP MAURO,

C. J. H EDRICK.

This process produces a hard com- 40 

